The Little Spidey is one of the four pets that can be summoned. It is just like a large spidey but tinier and blue. It is the weakest out of the six pets. It can be summoned by the Tier 1 Necromancer and by the Spider Queen. It will work as a shield for your units.
The cost for a Necromancer to summon a little spidey is 25 souls. There is a maximum of two little spideys per Necromancer. The Spider Queen Has to use 40 souls to summon on1, but can have a max of 3.
The power of the little spidey would be between the knight and the archer. The theoretic price is between the 10+ and 20 gems.
His real name is "Spidey baby" or "Baby spider"
Strangly when you looking into the gamefiles the baby spider load his special. So in fact if they even want to the baby spidey can in fact use his special.